KR20010073600A - Converting method for isoflavone glucoside compounds to isoflavone aglycone compounds contained in soybean and soybean extracts - Google Patents

Abstract

PURPOSE: A method for converting isoflavone glucoside in soybeans into isoflavone aglycone is provided, thereby isoflavone glucoside can be converted into isoflavone aglycone such as Daidzein, Glycitein and Genistein in higher yield. CONSTITUTION: The method for converting isoflavone glucoside into isoflavone aglycone comprises the steps of: mixing soybeans or their extract with acid solution having hydrogen concentration of pH 2.5 to 6.0; adding acid protease into the mixture; and enzyme reacting the mixture at 30 to 50 deg. C for 4 to 30 hours. Wherein, the acid protease is Sumizyme AP and the purification step of isoflavone aglycone may be optionally carried out after conversion by the adsorption of isoflavone aglycone into the resin.

Description

Converting method for isoflavone glucoside compounds to isoflavone aglycone compounds contained in soybean and soybean extracts}

The present invention relates to a method for converting an isoflavone glucoside compound contained in soybean and soybean extract to an isoflavone aglycone compound.

Soybean (大豆) in the present invention was used soybean soybean (물 大豆) and soybean extract (抽出 物) containing a large amount of isoflavone glucoside compound (prevastein) trade name (US Central Soya-CENTRAL) Soy extract commercially available from SOYA-manufactured) was used.

Daidzin, 6 "-OCH ₃ Dydzin (hereinafter referred to as 6" -OAc Dydzin), 6 "-COCH ₂ COOH (hereinafter referred to as 6" -OMal Dydzin), Glycithin (Glycitin), 6 "-OCH ₃ glycidin (hereinafter referred to as 6" -OAc glycidin), 6 "-COCH ₂ COOH glycidin (hereinafter referred to as 6" -OMal glycidin), Genistin ), 6 is referred to as "-OCH ₃ genistin (the 6" -OAc genistin) and 6 is referred to as "-COCH ₂ COOH genistin (the 6" -OMal genistin) isopropyl Flower the glucoside compound, such as a containing 1 ~ 50wt Soy extract is commercially available and the present invention converts the isoflavone glucoside compound in the soybean and soy extract into isoflavone aglycone compounds such as Daidzein, Glycitein, Genistein, etc. It is about how to let.

The structural formula of the isofurabon glucoside is represented by the following formula (I).

In the above formula

If R ₁ , R ₂ , R ₃ are each H, H, H

Glycithin if R ₁ , R ₂ , R ₃ are each H, OCH ₃ , H

Geninistin if R ₁ , R ₂ , R ₃ are each OH, H, H

If R ₁ , R ₂ , R ₃ are each H, H, OCH ₃ , 6 "-OAc didazine

6 "-OAc glycidin if R ₁ , R ₂ , R ₃ are each H, OCH ₃ OCH ₃

6 "-OAc Genistin if R ₁ , R ₂ , R ₃ are each OH, H, OCH ₃

If R ₁ , R ₂ , R ₃ are each H, H, COCH ₂ COOH, 6 "-OMal dydazine

6 "-OMal glycidin if R ₁ , R ₂ , R ₃ are each H, OCH ₃ , COCH ₂ COOH

If R ₁ , R ₂ , R ₃ are each OH, H, COCH ₂ COOH, it is 6 "-OMal zenithine.

Although much research has been conducted on the purification and commercialization of isoflavones in soybean and soy protein, most of them are related to obtaining isoflavone glucoside. Representative methods of preparing conventional isofurabon glucoside are as follows. The aqueous soybean and soybean meal were added with an aqueous alkali solution of pH 9.0 ~ pH 11.0 to 14 ~ 18 times compared to the raw material, and maintained at 80 ℃ ~ 100 ℃ for 2 ~ 5 hours to extract isoflavone glucoside. After solubilizing isoflavone glucoside in an acid solution of pH 2.0 to pH 5.0, the protein was precipitated, the supernatant and the precipitated protein were separated by centrifugation, and the separated supernatant was concentrated and powdered. Obtain glucoside.

To the glucoside thus prepared, glucoamylase, alpha-amylase, alpha-galactosidase, beta-galactosidase, pectinase and enzymes containing them are added 0.1 to 10 by weight to the isoflavone glucoside concentrate or powder. After 4 hours to 30 hours, the enzyme was converted to isoflavone aglycone, reextracted with alcohol or methanol, and the reextracted extract was concentrated to prepare a product having a content of 2 to 50 wt% of the total isoflavone aglycone compound.

However, the above-mentioned conventional method requires the precipitation and centrifugation process for protein separation, and it must be heated to 80 ~ 100 ° C for a long time, and the extraction purified water must be alkaline, and the large amount of extracted purified water is inconvenient. Not only that, but also the conversion rate was not satisfactory.

Among the isoflavone uglycones, Daidzein and Genistein are known to be effective in preventing osteoporosis and anti-cancer, especially breast and prostate cancer, in women and men, and have antibacterial and antioxidant effects. Food development is demanded.

An object of the present invention is a method of converting isoflavone glucoside compound contained in soybean and soybean extract into isoflavone aglycone compound, which is a kind of acidic protease, Sumizmeme (AP) enzyme. Can be used as a conversion enzyme to solubilize the protein contained in soybean and soy extract, so that the protein separation process can be omitted, and the isoflavone glucoside compound isoflavone ugly with high yield even in low temperature enzyme reaction. It is to provide a method for converting to a cone compound.

The present invention relates to a method for converting isoflavone compounds in soy extracts containing soybean and isoflavone glucoside compounds containing isoflavone glucoside compounds into isoflavone aglycone compounds. will be.

The conditions for carrying out the present invention are as follows.

That is, the conversion reaction is carried out in an acidic solution of pH 2.5 to pH 6.0, phosphoric acid or hydrochloric acid is used for pH control.

Reaction temperature is 30 degreeC-50 degreeC, and reaction time is 4 hours-30 hours.

In the present invention, an enzyme capable of converting isoflavone glucoside into isoflavone uglycone and dissolving and solubilizing protein is an acidic protease having a function of cleaving 1,4 glucoside bond.

As an adsorbent used to concentrate and recover the converted isoflavone aglycone compounds, a synthetic adsorbent sold under the trade name SEPABEADS SP 850 by Mitsubishi Chemical Co., Ltd. Aion EP20 20 was used.

The weight ratio of glucoside-containing soybean and soybean extract and the ratio of isoflavone extract purified water are 1: 5 ~ 1: 13, and the weight ratio with added enzyme is 0.1 to 8.0 weight.

The soy extract converted to isoflavone aglycone under the above conditions is filtered and the filtrate is refrigerated until used separately.

80 ethanol was extracted from the filtered residue by using warm water 1: 3 to 1: 8, and concentrated under reduced pressure.

After mixing the refrigerated filtrate and the reduced pressure concentrate in an appropriate amount, the adsorbent-filled column is passed. The ratio of the mixed solution and the adsorbent is carried out at 30: 1 to 200: 1.

Isoflavone aglycone compounds adsorbed on the synthetic adsorbent are eluted with 80 ethanol and concentrated under reduced pressure.

In this way, a soybean extract containing a large amount of isoflavone aglycone total compound is prepared.

The present invention will be described in more detail with reference to the following Examples. However, the present invention is not limited only to this embodiment.

Example 1.

100 g of a powdered soy extract (trade name, manufactured by Central Soya, Inc.) containing a total amount of isoflavone glucoside compound and 1000 g of purified water adjusted to pH 4 was added to an enzyme reactor, and an acid protease was added thereto. After adding 3 g of Sumizyme AP, which is a kind of), it was allowed to stand at 50 ° C. for 26 hours and filtered with filter paper to obtain 930 ml of filtrate and 170 g of residue.

Acidic proteases are enzymes that hydrolyze peptides or peptide bonds in proteins in an acidic atmosphere.

700 ml of ethanol was added to the filtrate residue, and the mixture was heated and stirred, filtered, and the filtrate was concentrated under reduced pressure and mixed with the filtrate obtained in the previous step.

Isoflavone glucoside is soluble in water and alcohol, while isofurabon aglycone is insoluble in water and soluble in alcohol.

Treatment of the filtered residue with ethanol is for extracting and recovering the isoflavone aglycone compound contained in the filtered residue.

Isoflavone uglycone compound having a low molecular weight when passed through a column filled with a synthetic beads (cepha bead S.P 850, manufactured by Mitsubishi Chemical Co., Ltd.) of 0.2-0.3 mm in diameter. Proteins having a molecular weight similar to that of isoflavone aglycone compounds are adsorbed by a synthetic adsorbent, and materials such as proteins or dietary fibers having a large molecular weight other than isoflavone aglycone pass through the column.

This is because the particles of the small size of the isoflavone aglycone compound molecules in the pores of the synthetic adsorbent can be adsorbed, but the particles of the large molecules are not adsorbed into the pores of the synthetic adsorbent.

After isoflavone aglycone and isoflavone aglycone-like substances are adsorbed onto the synthetic adsorbent, the adsorbent is eluted using 100 ml of 80 ethanol.

The synthetic adsorbent has a property of swelling by ethanol. When treated with ethanol, as the adsorbent swells, the pores of the adsorbent increase, so that the adsorbed substances are eluted.

The reason for treating the filtrate obtained by hydrolyzing the isoflavone glucoside compound with the adsorbent in the present invention is that the isoflavone aglycone in soybean and soybean extracts is recovered by adsorbing only the isoflavone aglycone compound to the adsorbent. To increase the content.

The eluted material was concentrated under reduced pressure to obtain 15 g of a powder containing a large amount of isoflavone aglycone compound.

The total amount of isoflavone aglycone compound in this powder was 19.60 wt.

The isoflavone glucoside compound content of the soy extract used in this example and the isoflavone aglycone content in the aglycone conversion obtained in this example are described in Table 1 below.

Isofurabon Jujube extract (100g) Uglycone Convertible (15g) Method Total compound Glycoside Daidzin 2.00wt ND HPLC Glycitin 0.30wt ND Genistin 2.50wt 0.19wt 6 "-OAc Daidzin 0.03wt ND 6 "-OAc Glycitin ND ND 6 "-OAc Genistin 0.03wt ND 6 "-OMal Daidzin 0.02wt ND 6 "-OMal Glycitin ND ND 6 "-OMal Genistin 0.02wt ND Uglycon Daidzein 0.01wt 8.00wt HPLC Glycitein 0.01wt 0.60wt Genistein 0.08wt 11.00wt Sum 5.00wt 19.6wt ※ ND: Undetected HPLC: High Performance Liquid Chromatography

As shown in the table, the conversion rate of the glucoside compound into the aglycone compound was 60 levels. This result means that the isoflavone glucoside equivalent to 96 wt% is converted to isoflavone aglycone in consideration of the molecular weight of isoflavone glucoside.

Example 2.

Except for using soybean extract (100 g) instead of soybean extract was carried out in the same manner as in Example 1 to obtain the results shown in Table 2. In this example, 100 g of skim soy flour was used as a starting material, and 15 g of a powder of 0.091wt of isoflavone aglycone compound content was obtained.

Isofurabon Skim soybean powder (100g) Uglycone Convertible (15g) Method Total compound Glycoside Daidzin 0.03wt ND HPLC Glycitin 0.03wt ND Genistin 0.01wt 0.001wt 6 "-OAc Daidzin 0.04wt ND 6 "-OAc Glycitin 0.02wt ND 6 "-OAc Genistin ND ND 6 "-OMal Daidzin 0.01wt ND 6 "-OMal Glycitin ND ND 6 "-OMal Genistin ND ND Uglycon Daidzein ND 0.040wt HPLC Glycitein ND 0.002wt Genistein ND 0.049wt Sum 0.15wt 0.091wt ※ ND: Not detected

Example 3.

The aglycone conversion of glucoside is converted according to the enzyme reaction time. Isoflavone glucoside compounds in soy extracts were compared with the percentage converted to isoflavone aglycone compounds according to enzyme reaction time.

The following table shows the total amount of isoflavone glucoside compound and the total amount of isoflavone aglycone compound according to the enzyme reaction time.

Enzyme Reaction Time (T) Isoflavone 0 4 8 12 16 20 24 28 32 36 40 Isoflavone Glucoside 100 30 15 10 6 4 trace trace trace trace trace Isoflavone ugly cone 0 70 85 90 94 96 99 99 99 99 99 ※ Below 1.0 when detecting trace-isofurbon glucoside compound

In the present invention, the quantitative analysis of isoflavone glucoside and isoflavone aglycone was performed by the following method.

The powder sample obtained in Example 1 was dissolved in 70 ethanol, filtered through 0.1 µm filter paper to extract only the isoflavone aglycone component, and the filtrate was used as an HPLC analysis sample.

○ HPLC condition

The HPLC instrument used was Waters, Inc., USA.

The column used Bondpak C ₁₈ Size 3.9 × 300 cm.

The detection wavelength was at 254 nm.

-Eluent is

A solution: 15 Acetonitrile-0.1 acetic acid was used.

Solution B: 35 Acetonitrile-0.1 acetic acid was used.

Detection flow rate was 0.1 ml / min.

○ standard

As the standard, glycoside compounds of reagent grade didazine, glycidine and genistin, and aglycone compounds of dizezein, glycidine and genistein were used.

The present invention can convert isoflavone aglycones, specifically, dydzein, glycidane, and genistein, to high conversion in soybean and soybean extracts containing isoflavone glucoside compounds.

Claims (3)

In the method for converting the glucose molecule of the isoflavone glucoside compound contained in the soybean or soybean extract to an isoflavone aglycone compound by enzymatic reaction, the soybean or soy extract is mixed with an acidic aqueous solution of pH 2.5-6.0 And adding acidic protease thereto to enzymatic reaction at a temperature of 30 to 50 ° C. for 4 to 30 hours to convert the isoflavone glucoside compound to isoflavone aglycone compound. The method of claim 1, wherein the isofurabon glucoside compound, wherein the acidic protease is Sumymeme AP, is converted to an isofurabon aglycone compound. The method according to claim 2, wherein the isoflavone aglycone compound is converted to an isoflavone aglycone compound by increasing the content of the isoflavone aglycone by adsorbing and concentrating the isoflavone aglycone compound obtained by the enzymatic reaction.